112 5977B Series MSD Troubleshooting and Maintenance Manual
4 General Maintenance
To Refill the Foreline Pump
Standard foreline pump only
Materials needed
• Foreline pump oil (6040-0621) – approximately 0.28 L required
• Funnel (9301-6461)
• Gloves, oil- and solvent-resistant
• Screwdriver, flat-blade, large (8730-0002)
• Drain plug O-ring (if required) (0905-1515)
• Hex key to remove drain plug (5 mm for Pfeiffer pump, 8710-1838)
Procedure
1 Drain the foreline pump. (See “To Drain the Foreline Pump” on page 111.)
2 Reinstall the drain plug. If the old O-ring appears worn or damaged,
replace it.
3 Remove the propping object from under the pump motor.
4 Add foreline pump oil until the oil level in the window is near, but not
above, the upper line. The foreline pump requires approximately 0.28 L of
oil.
5 Wait a few minutes for the oil to settle. If the oil level drops, add oil to bring
the oil level near the upper line.
6 Reinstall the fill cap.
7 If necessary, slide the foreline pump back under the analyzer chamber.
The foreline pump may be located on the floor, on the lab bench next to or
behind the MSD, or under the analyzer chamber at the back of the MSD.
8 Pump down the MSD.
The foreline pump can cause burns if touched when operating. It has a safety shield
to prevent the user from touching it.
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